qwick6 Posted November 7, 2010 Report Share Posted November 7, 2010 Today I replaced the coils and module on my 92 international 3.4 and after I was done the tach would no longer work. If anyone has any ideas I welcome them. Quote Link to comment Share on other sites More sharing options...
mfewtrail Posted November 7, 2010 Report Share Posted November 7, 2010 The tach signal wire goes to the ignition control module...so recheck all your connectors at the ignition module and make sure they're plugged in tightly + that no wiring there has come loose from the connectors. The tach wire is white in color and is located in the largest of the three connectors at the module. Quote Link to comment Share on other sites More sharing options...
qwick6 Posted November 7, 2010 Author Report Share Posted November 7, 2010 Thanks so much I will definately check that out tomorrow. Quote Link to comment Share on other sites More sharing options...
qwick6 Posted November 10, 2010 Author Report Share Posted November 10, 2010 So yesterday the tach starts working on its own and today it stops. I unplugged the connectors at the module and plugged them back in with no change. Its just the tach but im so anal it drives me nuts. Quote Link to comment Share on other sites More sharing options...
mra32 Posted November 10, 2010 Report Share Posted November 10, 2010 check for pinched wires coming off the ICM. Was this a used unit or band new? Reason for changing them? Quote Link to comment Share on other sites More sharing options...
qwick6 Posted November 11, 2010 Author Report Share Posted November 11, 2010 I purchased the car for winter and it had the CEL on. I read the code and it was code 42 so i put a used set of coils and module in that I had. The light is off and seems to run better but now that tach is not working. I traced the wires back and they look ok but still no change. Quote Link to comment Share on other sites More sharing options...
AL Posted November 12, 2010 Report Share Posted November 12, 2010 maybe use some connector cleaner on the connection to the icm Quote Link to comment Share on other sites More sharing options...
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